MONTE VISTA, Colo.—A 14-year-old boy told investigators he killed his mother and stepfather because he didn’t want to do household chores, then spent the evening watching movies and playing on a computer.

Authorities have charged John Caudle as an adult in the Oct. 26 slayings of 34-year-old Joanne Rinebarger and 38-year-old Tracy Rinebarger. Caudle faces several charges, including two counts of first-degree murder.

In an arrest affidavit, Caudle told investigators he took two .22 caliber pistols from a gun safe and shot his mother after the two argued. Caudle said he then hid in a laundry room and shot his stepfather when he walked past a short time later. The boy went to school the next morning before fleeing in the family pickup truck.

As news of the deadly mass shooting at Marjory Stoneman Douglas High School in Parkland, Florida, unfolded last week, Pia Guerra, a 46-year-old Vancouver-based artist, felt helpless. She couldn’t bring herself to go to sleep, so she began to draw.

Police who find suspected drugs during a traffic stop or an arrest usually pause to perform a simple task: They place some of the material in a vial filled with liquid. If the liquid turns a certain color, it’s supposed to confirm the presence of cocaine, heroin or other narcotics.